FrontPage Problem

Seems i having problems accessing a FrontPage enabled site. The problem is that when you actually connect to the site you get the user/pw prompt box and it won't accept the user/pw for the prompt or if it accepts it you 'll get a box that says you do not have permission to access this. I'm using the clients user/pw trying to access it. You can access the cpanel fine just not frontpage. Anyone have any ideas what it can be?

I'v tired that several times but still get this box after typing in the user/pw

" You do not have permission to do this operation. Ask your web site administrator to change your permssions then try again, or log on with a user account that has this permission. To log on with a different user account click ok "